This paper investigates basic reproductive parameters, ecology and population structure of the common cuttle sh. A total of 1217 individuals were sampled monthly from both the offshore bottom trawl and the inshore trammel net shery off the Mallorca Island (western Mediterranean) during 2017-2019. Mean size of individuals and sex-ratio differed between depths, with males and females being more abundant inshore and offshore waters respectively. The estimated size at rst maturity (L 50 ) was 87 mm for females and 78 mm for males. S. o cinalis has a continuous reproduction throughout the year with a spawning peak between March and June, and the temporal distribution of maturity stages by sex re ected the precocious maturation of males. Ovary development analysis showed an asynchronous oocyte development and a mean total fecundity of 158 ± 14 eggs/female. The stomach fullness was found to decrease during reproductive development while the vacuity index followed the opposite trend, indicating a lessening of the feeding activity during gonadal growth for both sexes. The feeding activity was higher in females compared to males, which was probably related to the higher energetic cost associated with reproduction. While the digestive gland index (DGI) in females did not decrease during the course of sexual maturation, depleted values of DGI were observed in spawning males re ecting sexual differences in allocation strategy at this stage. Those results suggested that common cuttle sh ful l the cost of reproduction through both current food intake and accumulated somatic reserves.
This paper investigates basic reproductive parameters, ecology and population structure of the common cuttlefish. A total of 1217 individuals were sampled monthly from both the offshore bottom trawl and the inshore trammel net fishery off the Mallorca Island (western Mediterranean) during 2017–2019. Mean size of individuals and sex-ratio differed between depths, with males and females being more abundant inshore and offshore waters respectively. The estimated size at first maturity (L50) was 87 mm for females and 78 mm for males. S. officinalis has a continuous reproduction throughout the year with a spawning peak between March and June, and the temporal distribution of maturity stages by sex reflected the precocious maturation of males. Ovary development analysis showed an asynchronous oocyte development and a mean total fecundity of 158 ± 14 eggs/female. The stomach fullness was found to decrease during reproductive development while the vacuity index followed the opposite trend, indicating a lessening of the feeding activity during gonadal growth for both sexes. The feeding activity was higher in females compared to males, which was probably related to the higher energetic cost associated with reproduction. While the digestive gland index (DGI) in females did not decrease during the course of sexual maturation, depleted values of DGI were observed in spawning males reflecting sexual differences in allocation strategy at this stage. Those results suggested that common cuttlefish fulfil the cost of reproduction through both current food intake and accumulated somatic reserves.
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